Directflow SBDR/SBD SERIES

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1 Bulletin /SBD-1 June 2005 Supersedes SBD-1 Dated February 2005 and -1 Dated March 2001 Directflow /SBD SERIES DIRECT GAS-FIRED MAKE-UP AIR SYSTEMS Cooling Can Be Added A MODEL FOR EVERY APPLICATION SBD Direct Gas-Fired Make-up Air Heaters Direct Gas-Fired Make-up Air Heater with Return Air Capability SBDF Direct Gas-Fired Duct Furnaces AIR DELIVERIES FROM 2,000 TO 120,000 SCFM. HEAT INPUT FROM 94 TO 15,552 MBH E.T.L. Available (100% Outside Air Only)

2 SBD DIRECT GAS-FIRED SERIES The Need for Make-Up Air Air exhausted from industrial or commercial buildings must be replaced. If provisions are not made for make-up air, there likely will be air starvation creating negative pressure within the building. This negative pressure, in turn, causes: outside air infiltration and cold drafts; down or back drafts in heating equipment flues, ventilators an stacks; reduced exhaust fan air volumes resulting in inadequate removal of contaminants; uncomfortable, and in many instances, unhealthy working conditions; and other problems. The Source of Make-Up Air With most applications requiring exhaust air provisions, replacement air must enter buildings either by infiltration through openings such as doors or windows, or supplied by a make-up air system. Infiltrated air is unheated, draft ridden and unfiltered resulting in an uncomfortable, uneven, and often unclean environment. A controlled source of make-up air eliminates the many problems of infiltration. HOW CAN YOU RECOGNIZE THE NEED FOR MAKE-UP AIR? Symptoms: Back drafts and frequent pilot outages on natural draft heating equipment Doors difficult to open Exhaust fans not exhausting air Cause: Negative inside pressure from too little air replacing the air being exhausted Symptoms: Heaters not heating buildings Cold drafts Dust and dirt being drawn into building Cause: Untreated outside air infiltrated into building because of negative inside pressure Symptoms: Employees develop nausea and headaches Make-Up Air The SBD Direct Gas-Fired Systems The SBD series of direct gas-fired make-up air systems was designed to furnish fresh, clean and heated air from a controlled source by the most fuel-efficient and cost effective means. The SBD systems employ a method of supplying heated air into a building by passing fresh air directly over a gas flame in the air stream. The burner utilizes the kinetic energy of the airflow to complete combustion with the products of combustion well within code prescribed safety limits. The direct gas-fired burner, depicted in Figure 1, consists of drilled port cast iron pipe and two perforated stainless steel combustion baffles. The arrangement and shape of the air holes in the baffles provide the injection of proper combustion air at all rates of firing over a wide turndown range of up to 22:1. Since all the heat of the fuel goes into the air stream being heated, the direct gas-fired unit has 100% combustion efficiency and 92% overall thermal efficiency (with 8% of the total heat lost in the latent heat of water formed in combustion). Cause: Build-up of inside contaminants due to inadequate ventilation Figure 1 COMBUSTION PATTERN 2

3 SBD 100% FRESH AIR APPLICATIONS The basic SBD system is designed to introduce heated 100% outside air into a building to replace that amount of air which is exhausted. It is often desirable to bring in an excess of make-up air over that exhausted to insure a positive pressure in the area. This eliminates the many problems of negative pressure. Normally the exhaust system is interlocked with the SBD make-up air system so that the units are in operation at the same time. During operation of the SBD, airflow is continuous with discharge of air temperature regulated by modulating controls. The air temperature controls will be electronic gas flame modulation. Each of these control systems allow the burner to operate at any point on its turndown range to provide a constant heater air discharge temperature The SBD system, in addition to its primary function as a make-up air heater, can also serve as a space heater. In many industrial and commercial applications it is practical and economically sound to use a single source of space heat and make-up air. In these instances, over-riding space air temperature controls are added to the basic discharge air temperature control system. SBDF DUCT FURNACE The SBDF system consists of the basic SBD direct gas-fired burner section without a blower section. The burner section is applied as a duct furnace in field-fabricated ventilation systems. All control and gas manifold options listed for the SBD systems are available with the SBDF direct gasfired duct furnaces. Such accessories as filters, dampers and intake hoods can also be furnished with the furnaces. To avoid stratification s of the heated make-up air, the SBDF duct furnace should be located on the suction side of the blower to take advantage of the mixing effect of the fans. While the performance data of the SBDF duct furnace is the same as that listed for the SBD system, a smaller size duct furnace may often be used with a field fabricated ventilation application. The burner section size is no longer predicated on the physical size of the SBD blower section. Consult your local Hastings sales representative for selection and dimensional information. 3

4 80% RETURN AIR CAPABILITY The system incorporates a return air dam-per down-stream of the direct gas-fired burner which provides an option of up to 80% return air and 20% fresh air, or 100% fresh air and no return air. The system is recommended for buildings requiring varying indoor air requirements or applications with variable exhaust air requirements. With the, less fuel is expended to heat less makeup air. Redesigned internal adjustable profile plates keep the velocity of the incoming air across the burner constant, regardless of the amount of fresh air and return air required. The lends itself to those ventilation applications incorporating supplemental space heating with make-up air requirements. The total air volume being circulated need not be 100% make- up air but can be a mixture of fresh air and return air to provide enough air to meet varying indoor air requirements. The variable volume of outdoor air allows unit to maintain a positive building pressure. The heated incoming air moves toward cold areas of infiltration and pressurizes the space eliminating stratification. Indoor air quality is maintained by a continual introduction of fresh outdoor air. The system retains the basic SBD system modulating discharge air control. In addition, a fresh air/return air selector switch is furnished (as standard). Manual potentiometer or room pressure control is available. Units built in compliance with ANSI Z83.18 standards. 50% RETURN AIR CAPABILITY The system incorporates a return air damper downstream of the direct gas-fired burner which provides an option of either 50% fresh air and 50% return air, or 100% fresh air and no return air. The system is recommended for multiple exhaust fan installations and other applications with variable exhaust air requirements. With the, less fuel is expended to heat less make-up air. In multiple exhaust fan applications the will deliver 100% fresh air damper position when both exhaust fans are operating. With only one fan in operation, the unit can be switched to handle 50% make-up air and 50% return air. The also lends itself to those ventilation applications incorporating supplemental space heating with make-up air requirements. The total air volume being circulated need not be 100% make-up air but can be a mixture of 50% fresh air and 50% return air. Since the heat output of the burner at the 50% fresh air and 50% return air position must not be allowed to exceed onehalf that of the 100% fresh air position, the unit selected must be capable of providing needed supplementary heat at the reduced firing rate. The system retains the basic SBD system modulating discharge air control. In addition, a fresh air/return air selector switch is furnished. 4

5 Standard Equipment General: Either of three horizontal blower arrangements are available as standard: HR-1 horizontal discharge, HR-2 down discharge, and HR-3 optional vertical up discharge as illustrated below. Cabinet: Bolted construction of aluminized steel; SB-112/115 of 18 gauge, SBD215/218 of 16 gauge, SBD222/227/233 with 16 gauge sides and 14 gauge top, and SBD-240 with 14 gauge cabinet. Access panels are provided to allow easy access to motors, drives and filters. Outside surface is primed with zincchromate and finished with a coat of enamel. Blower: Centrifugal forward curved, double width, double inlet, class 1 fan(s) (except SB-240 Backward Incline Fans) with solid turned ground shaft and self-aligning, 200,000 hour lubricatable ball bearings. All blower wheels are statically and dynamically balanced. Blower housings, bearings and adjustable motor base are mounted on a reinforced frame to insure rigidity and quiet operation. Adjustable drives are standard through 10 HP, fixed drives with 15 HP and larger motors. V-belt drives are sized for 135% of motor horsepower. Fan motors and drives are mounted within the blower cabinet. This affords motor protection and eliminates the operation hazard of V-belt drives external to the unit. Blower section interior is insulated with 1-2# density Foil Face insulation Motor: Energy Efficient (E.E.), T-frame, open drip-proof, 1800 RPM prelubricated ball bearing type for all standard voltages. Burner: Direct gas-fired line burner with spark ignited intermittent pilot for natural gas at inlet pressure from 6 oz. through 1 PSIG with up to 22:1 turndown ratio. Gas and Electric Controls: Main gas hand shut-off valve. Main and pilot gas pressure regulators Pilot controls Electric safety shut-off valve. Electronic modulating gas valve with temperature controller Electronic flame safeguard system. High temperature limit switch. Airflow switch Ignition transformer. Automatic mild weather burner lockout. Motor starter Control transformer. NEMA 1 control box. Remote control station with system switches and indicating lights. SAFETY AND LIMIT CONTROLS OF SBD SYSTEMS Discharge Air Temperature Sensor 5

6 Options and Accessories General: Horizontal unit blower arrangement horizontal up flow (HR-3) available. Vertical unit blower arrangement three Vertical Up and three vertical Down as illustrated below. Components: Weatherproof unit for outdoor installation including hinged and latched weatherproof control enclosure. Insulated burner section available on all units Stormproof weatherhood with birdscreen. Installed on air intake of horizontal, HR-1, HR-2 and HR-3, weatherproof units. Not available with optional vertical blower arrangements. Birdscreen for installation on the air intake of units with optional vertical blower arrangement. Filter section with V or Z frames for mounting 2 inch throwaway, cleanable or pleated filters. A clogged filter switch with indicating light is available as an optional item. Filter section can also be insulated. Shut-off dampers complete with two position damper motor and end switch. Discharge air damper suggested for outdoor installations. Low leakage dampers are also available. Discharge air louvers adjustable horizontal or vertical bladed louvers are available for mounting on the blower outlet. These louvers can be combined for double deflection air control. Service platform with guardrail per OSHA standard. Service platforms are available for indoor horizontal units only. Vibration isolators either rubber-in-shear or spring type for floor or roof mounting, or indoor suspension. Not compatible with curb mounted units. Vibration isolators are shipped unmounted. Internal fan/motor isolation is also available. (Horizontal only.) Extended grease lines for remote greasing of fan bearings from the control side of unit. Panels U.L. labeled main or remote panels. Variable pitch sheave for motors 15 HP and larger. Variable pitch sheaves are standard for motors 10 HP and smaller. Motors: Totally enclosed, two speed, explosion proof, automotive duty or chemical duty motors available on all units. Premium Energy Efficient available. Roof Curbs: Adapter frames and roof curbs available for horizontal units. Roof curbs are shipped knocked down. Miscellaneous: Motor and controls can be mounted on opposite side. Matching cooling coil, heat reclaim coil and evaporative cooling sections available for all models. Electric Controls: Fused disconnect switch dead front fused disconnect switch or circuit breaker mounted in main control box with dead front handle mechanism. Blocked intake switch complete with indicating light. Warning light is turned on in case of excessive pressure drop across intake. Low outlet temperature shut-off Shuts off blower, after time delay, if unit delivers cold air due to burner failure. Pre-purge cycle Blower purges unit cabinet for selected time, 7-second minimum, before burner turns on. Not normally required unless unit can fill with combustible vapors between cycles. This item furnished as standard with GE-GAPS controls. Circuit analyzer provides a network of indicating lights to check circuit continuity. Simplifies identification of malfunction control. Ultra-violet flame sensor ultra violet flame sensing is used in place of standard flame rod system. Desirable for applications where excessive condensation of moisture is encountered. Night setback thermostat cycles blower-burner on basis of space temperature. Night control can either be energized manually or by a time clock. Note: Burner and Gas Control options on page 7. VERTICAL UNIT BLOWER DISCHARGE ARRANGEMENTS (All sections and components are supported by special base frame and vertical support channels) *(Standard support channel heights 112 thru thru , ) 6

7 Options and Accessories Burners: Propane firing primary fuel a propane line burner is furnished with this option. Not available with ETL units. Propane firing standby fuel a three way hand valve is factory mounted. The pilot, however, stays on natural gas. This option is not designed for use with mixed propane-air gas with properties similar to natural gas. A standard burner will be furnished. Contact your Hastings sales representative for special applications with two speed motors being used with dual-fuel. Not available with ETL units. Gas Controls FM or GE-GAPS approved controls additional gas manifold controls are furnished to meet insurance authority requirements. High gas pressure regulator a high gas pressure regulator is substituted for the standard regulator with inlet gas pressures over 1 PSIG. Low gas pressure switch manual reset type with adjustable set point. Offered to meet special code requirements or where added protection is desired. Modulating room control system a solid state electronic temperature control system is available for space temperature control. Selectra A-200 modulation system a solid state signal conditioner to accept a 4-20MA or 0-10VDC signal for gas valve modulation. Series 14 Electronic Modulating Discharge Air Control Series (Standard) The Electronic gas flame modulation system features precise discharge air temperature control, decreasing variations or temperature swings. All components are pre-calibrated not requiring matching sets. Temperature selector is mounted in any convenient location or the dial can be incorporated on the remote control panel lid. Discharge air temperature can be quickly and easily reset to meet changing requirements. Sensor in the discharge air continuously senses outlet air temperature and transmits an instantaneous signal, through a solid state amplifier, to the modulator/regulator gas valve. Immediately responding to the signal from the sensor, the modulator/regulator valve changes gas pressure to control burner input and maintain discharge air temperature at a constant level. Options include: Over-riding two position room thermostat controls space temperature. Indoor-outdoor reset raises discharge air temperature one degree for every eight-degree drop in outdoor temperature. Series 44 Electronic Modulating Room Control Series (Optional) Electronic modulating system converts a single purpose makeup air unit into one with dual operating characteristics, heating the ventilating air while controlling the space temperature. The electronic modulating space temperature sensor maintains the room temperature, while the discharge air sensor prevents objectionable leaving air extremes. The basic system includes a solid state amplifier/control center, a discharge air monitor with high and low temperature sensor, a modulator/regulator valve, and a space temperature sensor with integral temperature selector. As an alternative, a selectrastat and thermistor sensing remote space temperature is also available. 7

8 SCHEMATIC PIPING DIAGRAMS Pilot requred for: All FM units unlisted. FM units over 2.5 million listed. 8

9 DIRECT GAS-FIRED SERIES NON ETL SERIES SELECTION TABLE Model (Non ETL) Air Delivery - SCFM Outlet Velocity - FPM Approx. Shipping Weight Lbs. MBH Input Air Temperature Rise Motor Horsepower Total Static Pressure (Refer to Notes Below) ¾ 1 1¼ 1½ 1 ¾ 2 2½ /4 ¾ 1 1 CHO CHO CHO ½ 1½ 1½ 2 CHO CHO CHO ½ 1½ CHO ½ 7½ 7½ ½ 7½ 7½ 7½ 7½ CHO / ½ ½ ½ 7½ ½ 7½ ½ 7½ 7½ ½ 7½ 7½ 7½ ½ 7½ CHO CHO CHO CHO CHO CHO ½ 7½ 7½ ½ 7½ 7½ 7½ ½ 7½ CHO ½ 7½ ½ CHO CHO CHO CHO CHO CHO CHO CHO CHO NA NA NA NA NA CHO NA NA NA CHO CHO CHO CHO NA NA NA NA NA NA NA NA NA NA NA CH NA NA NA NA CH0 CH0 CHO CH NA NA NA CH NA NA NA CH NA NA NA NA CH NA NA NA NA NA NA NA CH0 CH0 CH0 NOTES: 1. Use Total Static Pressure column that will overcome total system resistance. Approximate pressure drop for component and accessory items; burner ½, filter (dirty) ¼, intake hood 1/8, birdscreen 1/8, discharge lovuer 1/8. Damper resistance may be ignored. 2. NA Not available, CHO Contact Home Office. Key: CHO for Reduced R.A. Capabilities. 9

10 SBD DIRECT GAS-FIRED SERIES SBD SERIES SELECTION TABLE Air Outlet Approx. DeliveryVelocity Shipping Model - - Weight SCFM FPM LBS. MBH Input Air Temperature Rise Motor Horsepower Total Static Pressure (Refer to Notes Below) ¾ 1 1¼ 1½ 1 ¾ 2 2½ SBD NA 3/4 ¾ 1 1 NA NA NA NA 1½ 1½ 1½ 2 NA NA NA NA 1½ 1½ NA NA SBD NA NA ½ 7½ 7½ NA 5 7½ 7½ 7½ 7½ 7½ NA / ½ ½ ½ 7½ SBD ½ 7½ ½ 7½ 7½ ½ 7½ 7½ 7½ ½ 7½ NA NA NA NA NA NA ½ 7½ 7½ ½ 7½ 7½ 7½ SBD ½ 7½ NA ½ 7½ ½ SBD NA NA NA NA NA NA NA NA NA SBD NA NA NA NA NA SBD CH CH0 CH0 NA CH SBD CH CH CH CH0 CH0 CH0 NOTES: 1. Use Total Static Pressure column that will overcome total system resistance. Approximate pressure drop for components and accessory items; burner ½. Filter (dirty) ¼, intake hood 1/8, birdscreen 1/8, discharge louver 1/8. Damper resistance may be ignored. 2. NA- Not Available, CHO Contact Home Office 10

11 Selection Procedure: 1. Choose the SBD system for 100% outside air. 2. Determine required model size from selection table with desired SCFM of make-up air and MBH input or air temperature rise in ºF. Please note that: Air temp rise =.92 x MBH Input 1.08 x SCFM 3. For model size selected, read required motor horsepower to overcome total static pressure resistance. Approximate static pressure losses for component and accessory items are: burner ½ filter (dirty) ¼, intake hood 1/8, discharge louver 1/8. Damper resistance may be ignored. Also specify type of gas and gas pressure, mounting location, blower discharge arrangement, and motor electric characteristic MODEL DESIGNATION Example: Select a direct gas-fired heating system to heat 18,000 SCFM of 100% outside air with an air temperature rise of 90ºF. Total static pressure required is 1.75 w.c. Unit to be rooftop mounted with down discharge through roof, and furnished with throwaway filters and intake hood. Fuel is natural gas at 1 PSIG inlet pressure. 1. SBD system is chosen for 100% outside air. 2. At 18,000 SCFM and 90ºF temperature rise, select model size 218. Heat input will be 1,902 MBH. 3. For size 218 with 1.75 w.c. total static pressure, selection table indicates that a 15 HP motor is required. Selection is thus complete: Model SBD with 15 HP motor. Unit to be natural gas fired with 1 PSIG pressure, rooftop mounted, weatherproofed, HR-2 blower arrangement, 230/60/3 power, and furnished with 2 throwaway filters and intake hood. SBD XXX X XXX SB Blower Model Air Volume Heating Capacity SCFM/1000 MBH Input REMOTE CONTROL STATION Remote control station with switches and indicating lights is standard with SBD and SBDF direct gas-fired make-up air systems. The panel shown is typical for SBD unit. Front panel and wiring will change according to items furnished. Standard remote control station is 8 inches high, 5 inches wide and 3 ½ inches deep. A flush mounted panel is available as an optional item GAS MANIFOLD SIZE Based on standard 10 inlet gas pressure (Above 6900 MBH C.H.O) Maximum MBH Natural Gas Manifold Size NPT Electronic Modulation Electronic Modulation with GE-GAPS or FM ¼ ½ ½ FAN PERFORMANCE CURVES The following fan curves were developed from test data taken in accordance with AMCA standards. Belt losses are not included. FAN SELECTION EXAMPLE PROBLEM: Select SB ventilating unit and motor horsepower to deliver 6,000 SCFM at 1.50 w.c. total static pressure. Desired motor type is single speed, 1800 RPM, dripproof SOLUTION: a. Check fan performance curves for smallest SB model which will handle the specified air flow and static pressure. This proves to be the SB-115. b. Locate 6,000 SCFM on the horizontal axis of the SB- 115 fan performance curve and move vertically to the point of intersection with the 1.50 w.c. total static pressure line. This defines the operating point: fan speed will be 920 RPM and the motor will draw 3.5 HP, The next larger size of motor, 5 HP, is required. c. From the Reference Table on this page, we find that the 5 HP, 1800 RPM, dripproof motor has a 184T frame size. This size is smaller than the maximum motor frame size of 213T shown on SB-115 fan performance curve, so selection is acceptable. d. From the SB-115 performance curve, the fan outlet velocity is shown to equal SFCM/2.28. At the operating point of the selected unit, the outlet velocity is 6,000/2.28 or 2,632 FPM. MOTOR FRAME SIZE REFERENCE TABLE MOTOR TYPE 1800/900 RPM 1800/1200RPM One Winding Two Winding Motor HP 1800 RPM Dripproof or TEFC TEFC Dripproof Drip- Proof TEFC T 145T 145T 145T 145T 2 145T 145T 145T 182T 182T 3 182T 182T 182T 184T 184T 5 184T 184T 184T 215T 215T T 213T 215T 254T 254T T 215T 215T 256T 256T T 256T 256T 284T 284T T 284T 284T 286T 286T T 286T 286T 324T 324T T 286T 324T 324T 326T T 324T 326T 326T 364T T 326T 364T 365T 365T T 364T 365T 404T 404T T 405T 405T 405T 405T T 405T 444T 444T 445T NOTES: 1) All motors three phase. 2) Motors less than 1.5 HP have frame sizes that will fit within any SB model ventilating unit cabinet. 3) SB- 240 maximum frame size, 405T. For larger frame sizes consult factory. 11

12 (NON-ETL APPROVED) HORIZONTAL MODEL BASE UNIT (UP TO 80% R.A.) 112 THRU , 227, NOTES: 1. ** 2. SIDE ELVATION HR-1 ARRANGEMENT ON UNITS WITH MORE THAN 50% RETURN AIR CAPAILITY WILL HAVE AN INTAKE DAMPER & FILTER (OR SERVICE) SECTION AS STANDARD. SINGLE BLOWER UNITS ONLY MODELS SB-112/115. ON UNITS FROM 0 TO 50% RETURN AIR ONLY (NON-ETL), THESE ITEMS ARE OPTIONAL SIDE ELEVATION HR-1 ARRANGEMENT SEE PAGE 5 AND 6 FOR DISCHARGE DAMPER LAYOUTS. ALL DIMENSIONS IN INCHES. LIFTING LUGS LOCATED ON EACH COERNER OF INDIVIDUAL SECTIONS. C.H.O. FOR DIMENSIONS FOR ETL/CETL UNITS. MODEL A B C D E F G H J K L M N P R S T U ½ 2 13½ 16¼ ¾ ⅜ 29 6¾ ¾ ¾ ½ ½ 4¾ ¾ ¼ 19¾ ¾ ½ 51/ ¾ ¾ ½ 5 1/ ¼ 27¾ 10¼ ¼ 87½ 45 93½ 4½ 4⁹ ₁₆ ¼ 12¾ ¼ ¼ 4½ 4⁹ ₁₆ ¾ 13 25½ ¾ ¾ ½ ⁹ ₁₆ 40 53¾ 19 39¼ ⅜ 176¾ ⅝ SBD HORIZONTAL MODEL BASE UNIT SBD MODELS Size AA A B C D E F G H J K L M N O ⅞ 76⅞ 33 26½ 2⅝ 13½ 16¼ 8⅜ 36⅞ 40 12½ ¾ 1⅛ ¾ 83¾ ⅝ 16⅝ 19¾ 10⅛ 43¾ 40 12½ 13⅞ 26 39¾ 1⅛ ⅛ 75⅛ 35 2⅝ 18¼ 55⅜ 9⅞ 48⅛ 40 12½ 15⅛ 26 39¾ 1⅛ ⅛ 79⅛ 39 2⅝ 18⅞ 58⅜ 10⅜ 49⅛ 40 12½ 12⅝ 26 39¾ 1⅛ ⅛ 96⅝ ¼ 76⅛ 10¼ 67⅛ ¾ ⅜ 58 5⅜ 34⅜ 88⅞ 12¾ ¾ ⅛ ⅛ ⅛ ¾ ⅜ 42⅝ 150¼ 17⅞ ¾ 8 All dimensions in inches. NOTES: 1. SBD-112 through SBD-218 have combination lifting and hanging lugs. 2. SBD-222, SBD-227, SBD-233 and SBD- 240 have channel base frames with combination lifting-hanging lugs. (*) Base channel on SBD-222, SBD-227, SBD-233 and SBD-240 only. (**) 34 increase in length required per ETL. 12.

13 SBD OPTIONAL ROOF CURB Curb Adaptor Frame MODEL L ** 82⅝ 89⅜ 96⅞ 94⅞ LL *** 116⅝ 113⅜ - - W ⅛ 80⅛ Roof Curb MODEL L ** 81⅛ 87⅞ 92⅜ 93⅜ 107⅛ * LL *** 115⅛ 121⅞ W 32 ½ 39 ½ 74⅝ 78⅝ 96⅝ 114 ¼ All Dimensions in inches Channel frame for SBD-222, SBD- 227, SBD-233 and SBD-240 mounts directly to roof curb. NOTE: Duct adaptor for HR-2 curb mounted unit is furnished as standard equipment when Hastings curbs are supplied. *Includes Filter Section (SBD-240 only). **L dimensions for non-etl Approved Units. ***LL dimensions for ETL Approved Units. OPTIONAL ROOF CURB Curb Adapter Frame MODEL L 82 ⅝ 89 ⅜ 93 ⅞ 94 ⅞ (Non ETL) W ⅛ 80 ⅛ All dimensions in inches. Channel frame for SBD and 222, 227, 233 and 240 mounts directly to roof curb. Roof Curb Model L 81⅛ 87⅞ 92⅜ 93⅜ 144½ 172⅛ 188⅝ *252⅜ (Non ETL) W 32½ 39½ 74⅝ 78⅝ 106⅜ 113½ 140¼ 185⅛ NOTE: Duct adapter for HR-2 curb mounted units is furnished as standard equipment. (Provided only if Roof Curb is ordered.) *Curb length includes filter section for SBD-240 only. 13

14 SBD ACCESSORY ITEMS SBD ACCESSORY ITEMS SIZE A B C D E F G H J K L Filters No. & Sizes / /8 23 3/8 29 7/ /4 13 ½ 16 5/ /8 (4) 16 x 20 x ¾ 31 7/8 36 7/ / / /8 (8) 20 x 20 x /8 43 ¾ 31 7/ (2) 18 3/8 (2) 19 11/ /8 (12) 20 x 25 x /8 47 ¼ 35 7/ (2) 19 (2) /8 (12) 20 x 25 x /8 56 3/8 45 7/8 93 7/ (2) 24 7/32 (2) 27 ¾ 4 8 5/8 (24) 16 x 25 x /8 59 3/8 54 7/8 111 ¼ /8 (2) 34 5/16 (2) 34 5/ /8 (30) 20x25x2 & (6) 16x25x /8 63 7/ / ¾ (2) 34 5/16 (2) 44 3/ /8 (49) 20 x 25 x / / / (2) 42 5/8 (2) 57 3/ /8 (49) 24x24x2 & (7) 12x24x2 All dimensions in inches EQUIPMENT SPECIFICATIONS SECTION DESCRIPTION SB-112 SB-115 SB-215 SB-218 SB-222 SB-227 SB-233 SB-240 BLOWER FILTER (OPTIONAL) Discharge Arrangement Construction Horizontal Unit with Choice of HR-1 (Horizontal), HR-2 (Horizontal Down), or Optional HR-3 (Vertical up or Vertical Down) Aluminized Steel Casing Bolted Construction Casing Gauge /14 16/14 16/14 14 Outside Surface Finish Primed with Zinc-Chromate, Finish Coat of Enamel Type of Fans Centrifugal, Forward Curved, DWDI, Class 1 Number of Fans Outlet Area (Sq. Ft.) Ball Bearings Lubrication Self Aligned and Greaseable Pillow Block or Flange Mounted Means for Relubrication Bearing Size (inches) 1 1 3/ / /16 1 7/ / /16 2 7/16 Shaft Diameter (inches) 1 1 3/ / /16 1 7/ / /16 2 7/16 Motor Location Drives General Arrangement Internal Mounting Adjustable Standard thru 10 HP; Fixed Standard above 10 HP, Adjustable Optional Wheels Statically & Dynamically Balanced, Mounting on Separate Frame V-Bank Casing Gauge /16 14/16 14/16 14 Number of Filters and and 7 Size (inches) 16x20x2 20x20x2 20x25x2 20x25x2 16x25x2 (30) 20x25x2 and (6) 16x25x2 20x25x2 (49)24x24x2 and (7) 12x24x2 14

15 A. B. C. D. E. F. G. H. I. A. B. Furnish and install the following Hastings direct gasfired make-up air system. Blower Section Blower wheels shall be statically and dynamically balanced forwardly curved, double width, double inlet, class 1 except SB-240 with backkward incline fans Blower wheels shall be mounted on solid turned ground shaft with keyway for driven shaft. Bearings shall be 200,000 hour ball bearing, self aligning, and greaseable, pillow-block or flange mounted. Blower housings, bearings and adjustable motor base shall be mounted on a reinforced frame to insure rigidity and quiet operation. The driver and driven sheaves shall be of the keyed hub type. The driven sheave shall be of a fixed pitch diameter and the driver sheave shall be of a variable pitch diameter through 10 HP and fixed pitch above 10 HP. V-belt drives shall be sized for 135% of motor horsepower. Cabinet shall be constructed of high quality (18) (16) (14) gauge aluminized steel to insure long rust-free life. Cabinet interior insulated with 1-2# density foil face insulation. Access panels shall be provided to allow easy access to motors and filters (if ordered). Outside cabinet surface is primed with zincchromate and finished with air dried enamel. Burner Section: The burner shall be a direct gas-fired burner suitable for complete combustion of natural gas, propane or propane-air mixture, and having a turndown ration of up to 22:1. Burner combustion must be clean and odorless. Combustion efficiency must limit the products of combustion to a maximum of 5ppm carbon monoxide and a maximum of 0.5ppm nitrogen dioxide. SBD DIRECT GAS-FIRED SERIES Engineers Specifications C. D. E. The burner shall have stainless steel combustion Baffles, non-clogging gas ports, spark ignition and Flame safeguard system. Observation port shall be provided in burner cabinet. Profile plates to control proper air velocity across the burner shall be factory installed, adjusted during an actual firing test and locked in place before shipment. Motor: An Energy Efficient (E.E.) T-frame, ODP, 1800 RPM prelubricated ball bearing type motor shall be furnished for voltage as scheduled. Gas and Electric Controls: The following controls shall be furnished with the direct gas-fired make-up air system: Main gas hand shut-off valve. Main and pilot gas pressure regulators. Pilot controls. Electric safety shut-off valve. Electronic modulating gas valve with Discharge Air controller. Electronic flame safeguard system. High temperature limit switch. Airflow switch. Ignition transformer. Automatic mild weather burner lockout. Motor starter. Control transformer NEMA 1 control box. Remote control station with system switches and Indicating lights. Assembly: The system shall be factory assembled and wired with the exception of controls that are remote to the unit. Options and Accessories: The following items are to be furnished (Insert desired items from page 5 and 6 of this bulletin.) 15

16 In order to maintain our policy of continuous product improvement, we reserve the right to change prices, specification, ratings or dimensions without notice obligation. REPRESENTED BY: PO Box Yost Avenue Hastings, NE Phone (402) Fax (402)

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